I'm not really sure, while the duality of the ego style connection is nice it has definitely fell into the obscure while the 510 rose to the top. I just want to see all 510s have equal length, equal depth, and equal center pin height and width. It's not hard at all and necessary IMO, if innokin and Kanger would set the standard everyone else would follow suit I believe.How did the 510 itself become standard after Ego connections? Just seems like such a small and fragile diameter.